It is the fourth time the 25-year-old, who rejected the offer of a new Dons deal to move to Ibrox in the summer, has been sent off this season.

The midfielder will be hit with a three-game ban if the SFA panel uphold referee Willie Collum’s decision.

Jack will serve a two-game suspension for serious foul play and an additional ban for it being his second ordering off of the campaign. The red cards in the 3-2 defeat to Hibs in August and the 1-1 draw with Kilmarnock were overturned.

Aberdonian Jack’s dismissal during the 4-1 win over Hamilton in September stood.

The wait to discover the extent of May’s injury is a blow as the Reds attempt to recover from a slump that has yielded just four points from 15.

That dip began when speculation linking McInnes to the Rangers manager’s job began nearly six weeks ago. Aberdeen face Dundee away on Friday desperate to recover from back-to-back defeat to Gers that allowed the Ibrox club to leapfrog the Dons into second spot on goal difference.

Keeper Joe Lewis insists regardless of what is happening off field, the Dons must return to form at Dens Park.

Lewis said: “This month is massive as there are a lot of games to play between now and January.

“We need to make sure we analyse our games, improve and show that we are ready for Dundee, as that is a huge game.”

Whether McInnes is in the Dons dugout at Dens Park remains the subject of increased speculation, with Rangers’ first approach to talk to the 46-year-old rejected by the Dons.

Lewis said: “I’m the wrong person to ask whether the manager will stay or not. You’ll need to ask him or ask people in the know.

I know as much as you do. There has certainly been no lack of focus from the manager or the players. He has been focused and working hard in training.”